imagebuttonsexample4.java

一个用java开发界面的程序集(jfc核心编程)

package JFCBook.Chapter2.jdk12;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class ImageButtonsExample4 extends JPanel {
	public ImageButtonsExample4() {
		setLayout(new BorderLayout());
		JPanel buttonPanel = new JPanel();
		JPanel lowerPanel = new JPanel();
		add(buttonPanel, BorderLayout.CENTER);
		add(lowerPanel, BorderLayout.SOUTH);

		buttonPanel.setLayout(new GridLayout(2, 1, 4, 4));
		
		ok = new JButton("OK", new ImageIcon(getClass().getResource("images/ok_inactive.gif")));
		cancel = new JButton("Cancel", new ImageIcon(getClass().getResource("images/cancel_inactive.gif")));
		switchButton = new JButton("Switch orientation");

		// Get the initial orientation
		ComponentOrientation orientation = ok.getComponentOrientation();
		isLTR = (orientation == null || orientation.isLeftToRight());

		// Explicitly set text position of OK button
		ok.setHorizontalTextPosition(SwingConstants.RIGHT);

		// Specify locale-dependent alignment
		ok.setHorizontalAlignment(SwingConstants.LEADING);
		cancel.setHorizontalAlignment(SwingConstants.TRAILING);

		ok.setFont(new Font("Dialog", Font.BOLD, 14));
		cancel.setFont(new Font("Dialog", Font.BOLD, 14));
		
		Icon okIcon = new ImageIcon(getClass().getResource("images/ok.gif"));
		Icon cancelIcon = new ImageIcon(getClass().getResource("images/cancel.gif"));
		
		ok.setPressedIcon(okIcon);
		ok.setRolloverIcon(okIcon);
		cancel.setPressedIcon(cancelIcon);
		cancel.setRolloverIcon(cancelIcon);

		buttonPanel.add(ok);
		buttonPanel.add(cancel);
		lowerPanel.add(switchButton);

		switchButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent evt) {
				if (isLTR) {
					ok.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
					cancel.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
				} else {
					ok.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
					cancel.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
				}
				isLTR = !isLTR;
				ok.repaint();
				cancel.repaint();
			}
		});
	}

	public static void main(String[] args) {
		JFrame f = new JFrame("Image Buttons 4");
		f.getContentPane().add(new ImageButtonsExample4());
		f.pack();
		f.setVisible(true);
		f.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
	}

	JButton ok;
	JButton cancel;
	JButton switchButton;
	boolean isLTR = true;
}